Look at a couple of Youtube videos on Camtasia 9. It is a full fledged editor (and also does audio / video recording too). That's the winning property of it.
You just click a button to start recording, deliver your video content, press stop and then you can immediately start editing your content. Then you export and you're done.
With something like premiere you would have to record your audio and / or video with a different tool and spend a lot of time importing. I also found premier's UI to be crazy complex (in a very non-intuitive way). I haven't tried movie maker.
Camtasia's editing effects are just enough to make really nice screencast style videos without being overwhelming. I've gotten hundreds of positive reviews on my tech courses that were related to the production quality of the videos.
For example, the video on this course page[0] was made fully with Camtasia 9. All of the animations and even the slides / tooltips.
That whale animation and text dropping effect took around 5 minutes to make from scratch once I figured out what I wanted to do. All I had to do was pick some things from a few drop down boxes and drag 2 or 3 sliders around.